/*
 * Type-safe wrapper for WebGL in GWT.
 * 
 * Copyright (C) 2009 Hao Nguyen
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package gwt.g3d.client.camera;

import javax.vecmath.Matrix4f;

/**
 * An interface for defining a camera in 3D space.
 * 
 * @author hao1300@gmail.com
 */
public interface Camera {
  
  /**
   * Gets the projection matrix.
   */
  Matrix4f getProjectionMatrix();
  
  /**
   * Gets the projection matrix.
   * 
   * @param outMatrix the matrix to store the projection matrix.
   */
  void getProjectionMatrix(Matrix4f outMatrix);
  
  /**
   * Gets the view matrix.
   */
  Matrix4f getViewMatrix();
  
  /**
   * Gets the view matrix.
   * 
   * @param outMatrix the matrix to store the view matrix.
   */
  void getViewMatrix(Matrix4f outMatrix);
  
  /**
   * Gets the projection * view matrix.
   */
  Matrix4f getViewProjectionMatrix();
  
  /**
   * Gets the projection * view matrix.
   * 
   * @param outMatrix the matrix to store the projection * view matrix.
   */
  void getViewProjectionMatrix(Matrix4f outMatrix);
}
